refactor: remove User-based import and RBAC UserDingMapping endpoints

apps/server/src/rbac/rbac.controller.ts

@@ -19,7 +19,6 @@ import {
   UpdateUserDto,
   ResetPasswordDto,
   UpdateProfileDto,
-  CreateStudentDingMappingDto,
 } from './dto/rbac.dto';
 import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 import { RequirePermission } from '../auth/decorators/permission.decorator';
@@ -299,32 +298,6 @@ export class RbacController {
     }
   }
 
-
-  // ---- 钉钉用户绑定 ----
-
-  @Get('user-ding-mappings')
-  @RequirePermission('user:view')
-  async getStudentDingMappings() {
-    return this.rbacService.getUserDingMappings();
-  }
-
-  @Get('user-ding-mappings/unbound-users')
-  @RequirePermission('user:view')
-  async getUnboundUsers() {
-    return this.rbacService.getUnboundUsers();
-  }
-
-  @Post('user-ding-mappings')
-  @RequirePermission('user:edit')
-  async createStudentDingMapping(@Body() dto: CreateStudentDingMappingDto) {
-    return this.rbacService.createUserDingMapping(dto);
-  }
-
-  @Delete('user-ding-mappings/:id')
-  @RequirePermission('user:delete')
-  async deleteStudentDingMapping(@Param('id') id: string) {
-    return this.rbacService.deleteUserDingMapping(+id);
-  }
   // ---- 教师工作台 ----
 
   @Get('teacher-workspace')